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-450+x-690-x*8%/4>500
==> x-x*8%/4>500+450+690
==> x-x*2%>1640
==> x*(1-2%)>1640
==> x*98%>1640
==> x>1640÷98%
==> x>1640÷0.98
==> x>1673.47
==> x-x*8%/4>500+450+690
==> x-x*2%>1640
==> x*(1-2%)>1640
==> x*98%>1640
==> x>1640÷98%
==> x>1640÷0.98
==> x>1673.47
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